Electric drill



(No Model.)

I. B. STOREY. ELECTRIC DRILL.

' N0. 420,500. Patented Feb. 4, 1890.

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UNITED STATES PATENT OFFICE.

IMLE E. STOREY, OF BOULDER, COLORADO.

ELECTRIC DRILL.

SPECIFICATION forming part of Letters Patent No. 420,500, dated February4, 1890.

' Application filed April 16, 1889. Serial No. 307,417. (No model.)

To all whom it may concern.-

Be it known that I, IMLE E. STOREY, a citizen of the United States,residing in Boulder, in the county of Boulder and State of Colorado,have invented certain new and useful Improvements in Electric Drills, ofwhich the following is a specification.

Myinvention relates to electric drills. It has particular reference tothe general form of drill shown and described in my application seriallynumbered 281,609, filed August 1, 1888.

The object of the present invention is to improve the construction ofthe frame of the drill and the means for manipulating it.

The invention consists in the details of construction, which will now bedescribed with reference to the accompanying drawings, in which-Figure 1. represents a side elevation of the drill. Fig. 2 represents alateral section through the frame, showing the motor in plan. Fig. 8 isa perspective view of the standard or holder with universal-jointmechanism used in the manipulation of the drill. Fig. 4t is an enlargedsection of the armature and drill shafts; and Fig. 5 is a detail sectionof the universal joint, showing my improved compound clampingarrangement.

This is a rotary diamond drill, the drillpoint being shown at the upperend of Fig. 1. The. drill is driven by an electric motor of the samegeneral construction as shown in my application above referred tothat isto say, the field-magnets a are bolted to an annulus I), while thearmature occupies a central position within the annulus, and its shaft 0connects directly with the drill-shaft cl.

In my application referred to above the motor and its frame were mountedto slide within the main frame of the drill, while in this case themotor and its frame are stationary, and the main frame of the drillcarrying the drill-point is movable or adapted to slide within themotor-frame. The motor is supported in a rectangular frame 6, theannulus being inclosed by and bolted to it, as shown at c e. Thecross-bars e are provided with babbitted boxes 42 andv journal-boxes e.In the boxes 6 the armature-shaft c has its bearings. The armature-shaftis prevented from partaking of a longitudinal motion by means of collarsc c, adjusted upon the shaft against the journal-boxes. The drill-shaftproper d is hollow to allow of the passage of waterto the drill-point,and it extends through the armature-shaft and is feathered thereto inthe manner shown in Fig. 41. This admits dependently of thearmature-shaft, but they rot-ate together.

The main frame of the drill consists of the side rods ff and the endpieces ff The rods are adapted to slide through the boxes 6 and they arerigidly connected by means of binding-nuts to the cross-piecesff Theserods instead of passing on 'the outside of the motor, pass directlythrough the annulus b, between bobbins of the field-magnets of themotor. By this construction the drill is made much more compact andquite as strong as the construction of my other drill referred to.

The box through which the drill-shaft cl passes in the cross-piece f isfitted with peculiar form of ball-bearing. It consists of a sleeve g,feathered to and surrounding that portion of the shaft within thebearing, and one end of the sleeve is formed with an annular groove g,containing the steel balls. The balls rest against theshouldcr of thebox in the manner shown, and the sleeve is held in its position by nut gon the side of the bearing opposite the balls. The nut g i and sleeve 9are locked to the drill-shaft by "upon a single standard, which may berigidly bolted to the floor and roof of the mine or to any suitableframe-work. I mount upon the standard a spring-clip m, provided with[inger or bracket m. This clip is adj ustably secured to the standard bymeans of tightening-bolts m Upon the finger m there is supported asecond spring-clip n, which may be rigidly fastened thereto bytighteningbolts 91. The clip a may be rotated to any of longitudinalmotion of the drill-shaft in ICO position on the finger m. This clip isprovided with a socket.- n which is adapted to receive a conical pin 71projecting from the side of the annulus Z) of the drill or from abracket secured thereto. The construction of the socket a with respectto the clip a is such that the opening of the. socket and the openingfor the pin on run together, as shown in Fig. 5. The purpose of thisconstruction is to secure additional binding-leverage to preventvibration of the drill as far as possible. \Yhen the bolts 91 aretightened, the pin m is forced against the pin 01 thus clam ping the twopins together besides clam ping the clip upon the pin m, and when thenut a" on the lower end of pin a is screwed up tightly a very stiffconnection is maintained between the drill and the standard.

The feeding mechanism is substantially of the same form as thatdescribed in my application hereinbefore referred to, but it may be ofany suitable design.

The hand-wheel 1) (shown in Fig. 2) is intended to represent themechanism for manipulating the feed.

Having thus described my invention, I claim- 1. The combination, with adrill and its rectangular frame, of an electric motor whosefield-magnets are connected by a metallic ring, two of the side piecesof the drill-frame passing through said metallic ring and occupyingposit-ions between the bobbins of the field-magnets.

The combination, with a drill and its rectangular frame, of an electricmotor whose field-magnets are connected by a metallic ring, a frameconnected with the ring and supporting the armature-shaft, two of theside pieces of the drill-frame passing through said metallic ring andthrough hearings in the motor-frame and occupying positions between thebobbins of the field-magnets.

3. The combination, with a drill and its frame, of a motor inclosedwithin a ring, the frame of the drill passing through the ring.

4. The combination, with a drill and its frame, of a motor inclosedwithin a ring, bearings attached to said ring, the drill-fran'le beingarranged to slide in said bearings and through the ring.

5. The combination, with a drill havingattaehed to some portion of itsframe the conical pin n spring-clip 71, provided with conical socket aand a second straight socket at right angles thereto, the two sockets oropenings communicating with each other on the inside, for the purposedescribed.

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

IMLE E. STOREY.

Witnesses:

WM. A. ROSENBAUM, F. C. GRUEN.

